i went to the drags today and broke another cam. the only time the cam had been used. does anyone know if the pami cams are stronger or if they make a titanim cams? its starting to suck only getting to ride for a couple of passes.

 

What kind of cams are breaking? I wanna make sure don't get them.

 

i keep breaking the RWR A1 intake cam. i have a smaller cam that is a RWR 11 and it never breaks. i have broke 3 intake cams now.

 

Did you miss a shift? How high of an rpm do you think you were at? It sounds like Mr piston and Mr valve became better aquainted. I had that happen several times in my 400hp 302. Since it was a pushrod engine the pushrod was the weakest(and cheapest) link. Although I did bend several valves as well. With Rotax's OHC design things must be different. The cams lobe profile also dictates how well things remain in contact at high rpm. That is probably why the smaller cam is fine. Im guessing you have the lighter reciprocating parts like titanium retainers and checked the spring seat pressure.

 

i don't think it hits the piston. i think it would bend the value. it only breaks the outside lobe off. i checked piston to value clearence. i shift it at about 10-10,500.(i'm guessing)

 

DSmike- shift 5 rpm's sooner.[img]i/expressions/face-icon-small-happy.gif[/img] Are you running matched cams or 2 different profiles?

 

i bent my both exhaust valves by over reving.